CH^ETOMIUM. 



[ 156 ] Cn.ETOPHORACE.5'. 



rigid spines ; no transverse furrow ; an eye- 

 spot present ; organ of motion a flagelliform 

 filament. 



C. Volmcina (PI. 30. fig. 24 a). Oval, 

 internal substance brownisli-green ; eye- 

 spot red ; length 1-1100". Aqiiatic. This 

 appears to be the same as Trachelomonas 

 Volvocina. See Trachelojioxas. 



C. eaudata. Oval, hispid, with a short 

 tail; internal substance green; eye-spot red; 

 margin of carapace urceolate and toothed ; 

 length 1-850" ; aquatic. 



BiBL. Ehr. Infiis. ; id. Ber. d. Berl. Ah. 

 1840, 199 ; Dujardiu, Infus. 239. 



CH.ETO'MiUM, Kunze.— A genus of 

 Perisporiacei (Ascomycetous Fnngi), having 

 a filamentous mycelium bearing superficial 

 roundish or ovate conceptacles clothed with 

 hairs, finally opening above and containing 

 clavate asci with paraphyses ; sporidia sim- 

 ple, ovate. The asci in this genus are very 

 delicate and are readily absorbed, so that 

 frequently there is not a trace of them, and 

 the sporidia seem naked. British species : 



C. elatmn, Kunze. Conceptacles sub- 

 ovate, black or brown, more or less crusta- 

 ceous ; sporidia apiculate at each end. 

 Greville, Sc. Cnjpt. FL pi. 230. On mould- 

 ering straw, old matting, &c. Very com- 

 mon. 



C. chartarum, Ehr. Conceptacles sub- 

 globose, black, surrounded by a bright yel- 

 low spot ; sporidia roundish. On paper. 



C. (jlahnim, B. On damp straw. 



BiBL. Hook. Br. Fl. ii. pt. 2. p. 328; 

 Kunze, 3Ii/tolof/. Heft i. ; Fries, Si/st. My- 

 col. iii. p. 254, 255. 



CH./E'TOMONAS, Ehr.— A genus of In- 

 fusoria, of the family Cyclidina. 



Char. An oral vibratile organ (whether 

 a fiagelliform filament or riug of cilia is 

 uncertain) ; movement of animal slow, but 

 leaping elJ'ected by means of non-vibratile 

 brittles situated upon the body. 



In putrid animal and vegclable infusions; 

 in di'ad bodies of other organisms — Clos- 

 teria, &c. 



C. globulus (PI. 30. fig. 25«). Nearly 

 spherical, ash-coloured, setae numerous ; 

 length 1-2700". 



a constricta (PI. 30. fig. 25 h). Oblong, 

 constricted in the middle, hyaline, setaj two ; 

 len<?th 1-5400". 



BiBL. Ehr. Infvs. p. 248. 



CHzbrrOM OKl'Il A, Kiitz. = CoxFERViE 

 spec. (Rabenhorst, Fl. Ah/, iii. p; 327 ). 



CH/ETONO'TUS, Ehr.— A genus of mi- 

 croscopic aquatic animals, placed by Ehren- 



berg among the Rotatoria (Rotifera), and 

 by Dujardiu with the Infusoria. 



Ehreuberg places it in the family Ichthy- 

 DiXA. Dujardin gives the following cha- 

 racters : 



Body oblong, convex, and furaished with 

 hairs or scales above ; flat and provided 

 with very minute vibratile cilia beueath ; 

 terminated in front by a rounded margin, 

 near which is a distinct mouth : posteriorly 

 bifurcate or terminated by two caudiform 

 processes. 



The three or four species are found in 

 fresh water, amongst aquatic plants. Their 

 structure requires further investigation. 



C'hcetonohis larus (Pi. 31. fig. 24 ). Length 

 1-710 to 1-220". 



Dujardin appends Ichthydium, Ehr., to 

 this genus. 



BiBL. Ehr. Infus. 389; Duj. Inf. 568; 

 Mecznikow, Sieh. ^- Kdll. Zeitsch. 1865 

 {Qu. Mic. Jn. 1866, 240). 



CILETO'PHORA, Schrank.— A genus 

 of Chffitophoracefe (Confervoid Algse), cha- 

 racterized like Draparncddia by setigerous 

 branched filaments, but differing from the 

 latter by the filaments being imbedded in a 

 gelatinous matrix. The ChcpfophortB are 

 found in fresh water, forming little green 

 protuberances on stones, sticks, &c., usually 

 bright gi-een. The zoospores are formed 

 singly in the joints, and bear four ciha. 

 True fruit is figured by Berkeley in C. pisi- 

 fonnis, Gleani)igs of Br. Alg. pi. 1. fig. 1. 



The membrane of the filaments is very de- 

 licate; and the zoospores appear sometimes 

 to escape by its solution. British species : 



C. endivicpfoUa, Ag. Hassall, Alq. pi. 9. 

 fia-s. 1 , 2 ; Kutz. Tab. Ph/c. iii. pi. 21. fig. 3, 

 Ulva incrassata, Eng. Bot. 967. Common 

 in sti'eams. 



C. tuberculosa, Hook. Hass. I. c. pi. 9. 

 7, 8 ; Kiitz. I. c. pis. 19 and 21. Rhmkma 

 tuberculosa, Eng. Bot. 2366. Boggv pools. 



C. elegans, Ag. Hass. I. c. pi. 9. 3, 4 ; 

 Kiitz. /. c. pi. 20. Stagnant pools; com- 

 mon. 



C. pisiformis, Ag. Hass. /. c. pi. 9. 5, 6 ; 

 Greville,' Crijpt. t. 150; Kiitz. /. c. pi. 18; 

 Thuret, A)in. So. Xat. 3 ser. xiv. pi. 19. 

 figs. 1-3. Subalpine lakes. 



C. dilatatn, Hass. l. c. pi. 13. fig. 2. 



C. lonf/ceva, Carm. A doubtful species. 

 Hook. Br. Fl.u. pt. 1. 



Rabenhorst admits 10 species : Fl. Alg. 

 iii. 383. 



BinL. As above. 



CILETOPHORA'CE^.— A family of 



